This study will evaluate the efficacy, safety, and pharmacokinetics of adjuvant atezolizumab in combination with paclitaxel, followed by atezolizumab, dose-dense doxorubicin or epirubicin (investigator's choice), and cyclophosphamide, compared with paclitaxel followed by dose-dense doxorubicin or epirubicin (investigator's choice) and cyclophosphamide alone in patients with Stage II-III TNBC (Triple Negative Breast Cancer)
Atezolizumab will be administered by IV, 840 mg every 2 weeks, for 10 doses. Atezolizumab maintenance will be administered by IV, 1200 mg every 3 weeks to complete 1 year
Paclitaxel will be administered by IV, 80 mg/m\^2 every week for 12 weeks.
Dose-dense doxorubicin will be administered by IV, 60 mg/m\^2 every 2 weeks for a total of 4 doses. Or Dose-dense epirubicin will be administered by IV, (90 mg/m\^2) every 2 weeks for a total of 4 doses
Cyclophosphamide will be administered by IV, 600 mg/m\^2 every 2 weeks for 4 doses
Berazategui, Argentina
Ciudad Autonoma Buenos Aires, Argentina
Ciudad Autonoma Buenos Aires, Argentina
Córdoba, Argentina
La Rioja, Argentina
Rosario, Argentina
San Miguel de Tucumán, Argentina
San Salvador de Jujuy, Argentina
Viedma, Argentina